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Extend the binding to support specifying a different request type for
each direction.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20211206174259.68133-3-paul@crapouillou.net

Signed-off-by: Vinod Koul <vkoul@kernel.org>